AA 4912 then AA 3012 at O'Hare
Grand Rapids → Chicago → Pittsburgh
Timetable, Chicago time
16:22AA 4912 from Grand Rapids at the gate
17:00AA 3012 to Pittsburgh leaves the gate
38 min apart on the timetable
The last days
AA 4912 and AA 3012 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.